The stock market index closed Wednesday's session on an optimistic note. The Tunindex rose by 8359.98 points on a modest volume of TND 1.5 million, according to the stock market intermediary Tunisie Valeurs. The ALKIMIA share was the best performer of the session. On a volume of TND 14,000, the stock rose by 4.1% to TND 23.710. On the other hand, BNA recorded a 4% increase to TND 7.800. The shares of the state-owned bank gained TND 170,000 during the session. Since the beginning of the year, the stock is down 4.1%. BIAT was the most actively traded stock. Shares of the private bank ended the session on a positive note, rising 0.6% to TND 87.950, adding TND 310,000 to the market. CELLCOM was the session's worst performer. On a trading volume of TND 2,000, the share price fell by 4.5% to TND 1.500 dinars. ARTES was also among the biggest decliners of the session. The car retailer's share price fell by 2.1% to TND 6.160, taking its negative performance since the beginning of the year to -5.2%. Source: Age nce Tunis Afrique Presse